LTC6908 - Dual Output Oscillator with Spread Spectrum Modulation
LTC6909 - 1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation

LTC3853 - Triple Output, Multiphase Synchronous Step-Down Controller

Features

  • Click Here for LTC3853 Evaluation Kits
  • Triple, 120° Phased Controllers Reduce Required Input Capacitance and Power Supply Induced Noise
  • Configurable as a 180° Dual Phase Controller Plus a Single Phase Controller
  • The Third Phase Can Regulate Up to a 13.5V Output
  • High Efficiency: Up to 92%
  • RSENSE or DCR Current Sensing
  • ±0.75% 0.8V Output Voltage Accuracy
  • Phase-Lockable Fixed Frequency 250kHz to 750kHz
  • Supports Pre-Biased Outputs
  • Dual N-Channel MOSFET Synchronous Drive
  • Wide VIN Range: 4.5V to 24V Operation (28V Abs Max)
  • Adjustable Soft-Start Current Ramping or Tracking
  • Foldback Output Current Limiting
  • Output Overvoltage Protection
  • Dual Power Good Output Voltage Monitors
  • 40-Lead 6mm × 6mm QFN Package

Typical Application

LTC3853
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Description

The LTC3853 is a high performance triple output stepdown switching regulator controller that drives all N-channel synchronous power MOSFET stages. Power loss and supply noise are minimized by operating the output stages out of phase. The part can be configured as a dual phase controller plus a single phase controller if needed. The part can also be configured to provide a single 3-phase output for even higher output currents.

A wide 4.5V to 24V (28V maximum) input voltage supply range encompasses most battery chemistries and intermediate bus voltages. Phase 3 can regulate output voltages up to 13.5V. A constant frequency current mode architecture allows for a phase-lockable frequency up to 750kHz.

Independent TK/SS pins for each output ramps the output voltages and can be configured for coincident or ratiometric tracking. Current foldback limits MOSFET heat dissipation during short-circuit conditions. The MODE/PLLIN pin selects among Burst Mode® operation, pulse-skipping or continuous inductor current modes.
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Packaging

QFN-40

LTC3853
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Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC3853EUJ#PBF QFN 40 E $5.04 $3.53 View
LTC3853EUJ#TRPBF QFN 40 E   $3.59 View
LTC3853IUJ#PBF QFN 40 I $5.63 $3.94 View
LTC3853IUJ#TRPBF QFN 40 I   $4.00 View
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Evaluation Kits

Part Number Description Price
DC1349A LT3853EUJ Demo Board | 6.5V ≤ VIN ≤ 14V, VOUTS: 1.2V/15A, 1.8V/15A, 2.5V/15A $250.00
DC1254A LT3853EUJ Demo Board | 6.5V ≤ VIN ≤ 24V, VOUTS: 1.8V/5A, 2.5V/5A, 3.3V/5A $250.00
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Applications

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Simulate

To simulate selected Linear Technology products, please download LTSpice / SwitcherCAD III. This powerful schematic capture and simulation tool includes macro models for 80% of Linear Technology's switching regulators, over 200 op amp models, as well as resistors, transistors and MOSFET models.

For other simulation tools, visit our Design Simulation and Device Models page.

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